LTC4007EUFD-1#TRPBF Linear Technology, LTC4007EUFD-1#TRPBF Datasheet - Page 6

IC CHARGER BATTERY 4A 24-QFN

LTC4007EUFD-1#TRPBF

Manufacturer Part Number
LTC4007EUFD-1#TRPBF
Description
IC CHARGER BATTERY 4A 24-QFN
Manufacturer
Linear Technology
Type
Battery Chargerr
Datasheet

Specifications of LTC4007EUFD-1#TRPBF

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
6 V ~ 28 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-WFQFN Exposed Pad
Output Current
4A
Output Voltage
4.1/4.2V
Operating Supply Voltage (min)
6V
Operating Supply Voltage (max)
28V
Operating Temp Range
-40C to 85C
Package Type
QFN
Mounting
Surface Mount
Pin Count
24
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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LTC4007-1
TYPICAL PERFOR A CE CHARACTERISTICS
PI FU CTIO S
ACP(Pin 1): Open-Drain output to indicate if the AC
adapter voltage is adequate for charging. This pin is pulled
low by an internal N-channel MOSFET if DCIN is below
BAT. A pull-up resistor is required. The pin is capable of
sinking at least 100µA.
R
placing a resistor, R
required.
If this resistor is not present, the charger will not start.
FAULT (Pin 3): Active low open-drain output that indi-
cates charger operation has stopped due to a low-battery
conditioning error, or that charger operation is suspended
due to the thermistor exceeding allowed values. A pull-up
resistor is required if this function is used. The pin is
capable of sinking at least 100µA.
GND (Pin 4): Ground for Low Power Circuitry.
6
T
The timer period is t
U
(Pin 2): Timer Resistor. The timer period is set by
U
100
95
90
85
80
75
Efficiency at 19VDC V
U
RT
0.50
TIMER
, to GND. This resistor is always
1.00
CHARGE CURRENT (A)
W
= (1hour • R
1.50
U
16.8V
12.6V
2.00
IN
RT
2.50
/154K).
40071 G10
3.00
3C4C (Pin 5): Select 3-cell or 4-cell float voltage by
connecting this pin to GND or open, respectively. Internal
14µA pull-up to 5.3V. This pin can also be driven with
open-collector/drain logic levels. High: 4 cell. Low: 3 cell.
LOBAT (Pin 6): Low-Battery Indicator. Active low digital
output. Internal 10µA pull-up to 3.5V. If the battery
voltage is below 3.25V/cell (or 3.173V/cell for 4.1V chem-
istry batteries) LOBAT will be low. The pin is capable of
sinking at least 100µA. If V
an external pull-up.
NTC (Pin 7): A thermistor network is connected from NTC
to GND. This pin determines if the battery temperature is
safe for charging. The charger and timer are suspended
and the FAULT pin is driven low if the thermistor indicates
a temperature that is unsafe for charging. The thermistor
function may be disabled with a 300k to 500k resistor from
DCIN to NTC.
ITH (Pin 8): Control Signal of the Inner Loop of the Current
Mode PWM. Higher ITH voltage corresponds to higher
charging current in normal operation. A 6k resistor, in
series with a capacitor of at least 0.1µF to GND provides
loop compensation. Typical full-scale output current is
40µA. Nominal voltage range for this pin is 0V to 3V.
100
95
90
85
80
75
Efficiency at 12.6V with 15VDC V
0.50
1.00
CHARGE CURRENT (A)
1.50
2.00
LOGIC
2.50
is greater than 3.3V, add
40071 G11
IN
3.00
40071f

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